AIPMT PRELIMS2009Physics-Electromagnetic Induction
AIPMT PRELIMS 2009 Physics Faraday's Law MCQ Question
Type: MCQ-numerical-Hard-Class 12
A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 mm/s. The induced emf in the loop when the radius is 2 cm is:
A
4.8 π μV
B
0.8 π μV
C
1.6 π μV
D
3.2 π μV
Correct Answer
Option D
Detailed Explanation
The induced emf (ε) is given by ε = -dΦ/dt, where Φ is the magnetic flux. Φ = B × πr². Differentiating with respect to time, ε = -B × 2πr × (dr/dt). Substituting B = 0.04 T, r = 0.02 m, dr/dt = -0.002 m/s, ε = 1.6 π μV.
Found an issue with this question?